Masi Images of Comet Hale-Bopp

Five images of the comet Hale-Bopp that I have taken this
morning (8 Feb. 1997).
First image: (4.08 UT 5 min exp.) has been processed with a log scaling;
Second image: (4.21UT 8 min exp.) has been processed with a square root
scaling;
Third image: (4.21UT 8 min exp.) has been processed with a log scaling;
Fourth image: (4.32UT 12 min exp.)has been processed with a square root
scaling;
Fifth image: (4.32UT 12 min exp.)has been processed with a square root
scaling and have been introduced pseudocolors.

The bright star visible in the pictures (except first image) is Gamma Sge.
The sky was clear, the comet was clearly naked-eye visible, near Gamma
Sge.
The field id about 30.7x20.6 Arcmin.
To scale the images I have used a software done by me.